2 This file is part of GNUnet
3 (C) 2010, 2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP transport protocol
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 * @author Matthias Wachs
29 #include "plugin_transport_udp.h"
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_util_lib.h"
32 #include "gnunet_fragmentation_lib.h"
33 #include "gnunet_nat_lib.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_resolver_service.h"
36 #include "gnunet_signatures.h"
37 #include "gnunet_constants.h"
38 #include "gnunet_statistics_service.h"
39 #include "gnunet_transport_service.h"
40 #include "gnunet_transport_plugin.h"
41 #include "transport.h"
43 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
47 * Number of messages we can defragment in parallel. We only really
48 * defragment 1 message at a time, but if messages get re-ordered, we
49 * may want to keep knowledge about the previous message to avoid
50 * discarding the current message in favor of a single fragment of a
51 * previous message. 3 should be good since we don't expect massive
52 * message reorderings with UDP.
54 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
57 * We keep a defragmentation queue per sender address. How many
58 * sender addresses do we support at the same time? Memory consumption
59 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
60 * value. (So 128 corresponds to 12 MB and should suffice for
61 * connecting to roughly 128 peers via UDP).
63 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
68 * Closure for 'append_port'.
70 struct PrettyPrinterContext
73 * Function to call with the result.
75 GNUNET_TRANSPORT_AddressStringCallback asc;
83 * Port to add after the IP address.
91 * Which peer is this session for?
93 struct GNUNET_PeerIdentity target;
96 * Address of the other peer
98 const struct sockaddr *sock_addr;
103 * Desired delay for next sending we send to other peer
105 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
108 * Desired delay for next sending we received from other peer
110 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
113 * expected delay for ACKs
115 struct GNUNET_TIME_Relative last_expected_delay;
118 struct GNUNET_ATS_Information ats;
120 struct FragmentationContext * frag_ctx;
124 struct SessionCompareContext
127 const struct GNUNET_HELLO_Address *addr;
132 * Closure for 'process_inbound_tokenized_messages'
134 struct SourceInformation
139 struct GNUNET_PeerIdentity sender;
147 * Number of bytes in source address.
151 struct Session *session;
156 * Closure for 'find_receive_context'.
158 struct FindReceiveContext
161 * Where to store the result.
163 struct DefragContext *rc;
168 const struct sockaddr *addr;
171 * Number of bytes in 'addr'.
175 struct Session *session;
181 * Data structure to track defragmentation contexts based
182 * on the source of the UDP traffic.
188 * Defragmentation context.
190 struct GNUNET_DEFRAGMENT_Context *defrag;
193 * Source address this receive context is for (allocated at the
194 * end of the struct).
196 const struct sockaddr *src_addr;
199 * Reference to master plugin struct.
201 struct Plugin *plugin;
204 * Node in the defrag heap.
206 struct GNUNET_CONTAINER_HeapNode *hnode;
209 * Length of 'src_addr'
217 * Closure for 'process_inbound_tokenized_messages'
219 struct FragmentationContext
221 struct FragmentationContext * next;
222 struct FragmentationContext * prev;
224 struct Plugin * plugin;
225 struct GNUNET_FRAGMENT_Context * frag;
226 struct Session * session;
228 struct GNUNET_TIME_Absolute timeout;
232 * Function to call upon completion of the transmission.
234 GNUNET_TRANSPORT_TransmitContinuation cont;
237 * Closure for 'cont'.
241 size_t bytes_to_send;
245 struct UDPMessageWrapper
247 struct Session *session;
248 struct UDPMessageWrapper *prev;
249 struct UDPMessageWrapper *next;
253 struct GNUNET_TIME_Absolute timeout;
256 * Function to call upon completion of the transmission.
258 GNUNET_TRANSPORT_TransmitContinuation cont;
261 * Closure for 'cont'.
265 struct FragmentationContext *frag_ctx;
271 * UDP ACK Message-Packet header (after defragmentation).
273 struct UDP_ACK_Message
278 struct GNUNET_MessageHeader header;
281 * Desired delay for flow control
286 * What is the identity of the sender
288 struct GNUNET_PeerIdentity sender;
293 * We have been notified that our readset has something to read. We don't
294 * know which socket needs to be read, so we have to check each one
295 * Then reschedule this function to be called again once more is available.
297 * @param cls the plugin handle
298 * @param tc the scheduling context (for rescheduling this function again)
301 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
304 * We have been notified that our readset has something to read. We don't
305 * know which socket needs to be read, so we have to check each one
306 * Then reschedule this function to be called again once more is available.
308 * @param cls the plugin handle
309 * @param tc the scheduling context (for rescheduling this function again)
312 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
315 * Function called for a quick conversion of the binary address to
316 * a numeric address. Note that the caller must not free the
317 * address and that the next call to this function is allowed
318 * to override the address again.
321 * @param addr binary address
322 * @param addrlen length of the address
323 * @return string representing the same address
326 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
328 static char rbuf[INET6_ADDRSTRLEN + 10];
329 char buf[INET6_ADDRSTRLEN];
333 const struct IPv4UdpAddress *t4;
334 const struct IPv6UdpAddress *t6;
338 if (addrlen == sizeof (struct IPv6UdpAddress))
342 port = ntohs (t6->u6_port);
343 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
346 else if (addrlen == sizeof (struct IPv4UdpAddress))
350 port = ntohs (t4->u4_port);
351 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
359 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
360 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
367 * Function called to convert a string address to
370 * @param cls closure ('struct Plugin*')
371 * @param addr string address
372 * @param addrlen length of the address
373 * @param buf location to store the buffer
374 * @param added location to store the number of bytes in the buffer.
375 * If the function returns GNUNET_SYSERR, its contents are undefined.
376 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
379 udp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
380 void **buf, size_t *added)
382 struct sockaddr_storage socket_address;
383 int ret = GNUNET_STRINGS_to_address_ip (addr, addrlen,
386 if (ret != GNUNET_OK)
387 return GNUNET_SYSERR;
389 if (socket_address.ss_family == AF_INET)
391 struct IPv4UdpAddress *u4;
392 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
393 u4 = GNUNET_malloc (sizeof (struct IPv4UdpAddress));
394 u4->ipv4_addr = in4->sin_addr.s_addr;
395 u4->u4_port = in4->sin_port;
397 *added = sizeof (struct IPv4UdpAddress);
399 else if (socket_address.ss_family == AF_INET6)
401 struct IPv6UdpAddress *u6;
402 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
403 u6 = GNUNET_malloc (sizeof (struct IPv6UdpAddress));
404 u6->ipv6_addr = in6->sin6_addr;
405 u6->u6_port = in6->sin6_port;
407 *added = sizeof (struct IPv6UdpAddress);
409 return GNUNET_SYSERR;
414 * Append our port and forward the result.
416 * @param cls a 'struct PrettyPrinterContext'
417 * @param hostname result from DNS resolver
420 append_port (void *cls, const char *hostname)
422 struct PrettyPrinterContext *ppc = cls;
425 if (hostname == NULL)
427 ppc->asc (ppc->asc_cls, NULL);
431 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
432 ppc->asc (ppc->asc_cls, ret);
438 * Convert the transports address to a nice, human-readable
442 * @param type name of the transport that generated the address
443 * @param addr one of the addresses of the host, NULL for the last address
444 * the specific address format depends on the transport
445 * @param addrlen length of the address
446 * @param numeric should (IP) addresses be displayed in numeric form?
447 * @param timeout after how long should we give up?
448 * @param asc function to call on each string
449 * @param asc_cls closure for asc
452 udp_plugin_address_pretty_printer (void *cls, const char *type,
453 const void *addr, size_t addrlen,
455 struct GNUNET_TIME_Relative timeout,
456 GNUNET_TRANSPORT_AddressStringCallback asc,
459 struct PrettyPrinterContext *ppc;
462 struct sockaddr_in a4;
463 struct sockaddr_in6 a6;
464 const struct IPv4UdpAddress *u4;
465 const struct IPv6UdpAddress *u6;
468 if (addrlen == sizeof (struct IPv6UdpAddress))
471 memset (&a6, 0, sizeof (a6));
472 a6.sin6_family = AF_INET6;
473 #if HAVE_SOCKADDR_IN_SIN_LEN
474 a6.sin6_len = sizeof (a6);
476 a6.sin6_port = u6->u6_port;
477 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
478 port = ntohs (u6->u6_port);
482 else if (addrlen == sizeof (struct IPv4UdpAddress))
485 memset (&a4, 0, sizeof (a4));
486 a4.sin_family = AF_INET;
487 #if HAVE_SOCKADDR_IN_SIN_LEN
488 a4.sin_len = sizeof (a4);
490 a4.sin_port = u4->u4_port;
491 a4.sin_addr.s_addr = u4->ipv4_addr;
492 port = ntohs (u4->u4_port);
498 /* invalid address */
503 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
505 ppc->asc_cls = asc_cls;
507 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
512 * Check if the given port is plausible (must be either our listen
513 * port or our advertised port). If it is neither, we return
516 * @param plugin global variables
517 * @param in_port port number to check
518 * @return GNUNET_OK if port is either open_port or adv_port
521 check_port (struct Plugin *plugin, uint16_t in_port)
523 if ((in_port == plugin->port) || (in_port == plugin->aport))
525 return GNUNET_SYSERR;
531 * Function that will be called to check if a binary address for this
532 * plugin is well-formed and corresponds to an address for THIS peer
533 * (as per our configuration). Naturally, if absolutely necessary,
534 * plugins can be a bit conservative in their answer, but in general
535 * plugins should make sure that the address does not redirect
536 * traffic to a 3rd party that might try to man-in-the-middle our
539 * @param cls closure, should be our handle to the Plugin
540 * @param addr pointer to the address
541 * @param addrlen length of addr
542 * @return GNUNET_OK if this is a plausible address for this peer
543 * and transport, GNUNET_SYSERR if not
547 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
549 struct Plugin *plugin = cls;
550 struct IPv4UdpAddress *v4;
551 struct IPv6UdpAddress *v6;
553 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
554 (addrlen != sizeof (struct IPv6UdpAddress)))
557 return GNUNET_SYSERR;
559 if (addrlen == sizeof (struct IPv4UdpAddress))
561 v4 = (struct IPv4UdpAddress *) addr;
562 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
563 return GNUNET_SYSERR;
565 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
566 sizeof (struct in_addr)))
567 return GNUNET_SYSERR;
571 v6 = (struct IPv6UdpAddress *) addr;
572 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
575 return GNUNET_SYSERR;
577 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
578 return GNUNET_SYSERR;
580 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
581 sizeof (struct in6_addr)))
582 return GNUNET_SYSERR;
589 * Destroy a session, plugin is being unloaded.
592 * @param key hash of public key of target peer
593 * @param value a 'struct PeerSession*' to clean up
594 * @return GNUNET_OK (continue to iterate)
597 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
599 struct Plugin *plugin = cls;
600 struct Session *s = value;
601 struct UDPMessageWrapper *udpw;
602 struct UDPMessageWrapper *next;
604 LOG (GNUNET_ERROR_TYPE_DEBUG,
605 "Session %p to peer `%s' address ended \n",
607 GNUNET_i2s (&s->target),
608 GNUNET_a2s (s->sock_addr, s->addrlen));
609 if (s->frag_ctx != NULL)
611 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
612 GNUNET_free (s->frag_ctx);
616 udpw = plugin->ipv4_queue_head;
620 if (udpw->session == s)
622 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
624 if (udpw->cont != NULL)
625 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
631 udpw = plugin->ipv6_queue_head;
635 if (udpw->session == s)
637 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
639 if (udpw->cont != NULL)
640 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
646 plugin->env->session_end (plugin->env->cls, &s->target, s);
648 GNUNET_assert (GNUNET_YES ==
649 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
650 &s->target.hashPubKey,
653 GNUNET_STATISTICS_set(plugin->env->stats,
654 "# UDP sessions active",
655 GNUNET_CONTAINER_multihashmap_size(plugin->sessions),
664 * Disconnect from a remote node. Clean up session if we have one for this peer
666 * @param cls closure for this call (should be handle to Plugin)
667 * @param target the peeridentity of the peer to disconnect
668 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
671 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
673 struct Plugin *plugin = cls;
674 GNUNET_assert (plugin != NULL);
676 GNUNET_assert (target != NULL);
677 LOG (GNUNET_ERROR_TYPE_DEBUG,
678 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
679 /* Clean up sessions */
680 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
683 static struct Session *
684 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
685 const void *addr, size_t addrlen,
686 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
689 const struct IPv4UdpAddress *t4;
690 const struct IPv6UdpAddress *t6;
691 struct sockaddr_in *v4;
692 struct sockaddr_in6 *v6;
697 case sizeof (struct IPv4UdpAddress):
698 if (NULL == plugin->sockv4)
703 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
704 len = sizeof (struct sockaddr_in);
705 v4 = (struct sockaddr_in *) &s[1];
706 v4->sin_family = AF_INET;
707 #if HAVE_SOCKADDR_IN_SIN_LEN
708 v4->sin_len = sizeof (struct sockaddr_in);
710 v4->sin_port = t4->u4_port;
711 v4->sin_addr.s_addr = t4->ipv4_addr;
712 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
714 case sizeof (struct IPv6UdpAddress):
715 if (NULL == plugin->sockv6)
721 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
722 len = sizeof (struct sockaddr_in6);
723 v6 = (struct sockaddr_in6 *) &s[1];
724 v6->sin6_family = AF_INET6;
725 #if HAVE_SOCKADDR_IN_SIN_LEN
726 v6->sin6_len = sizeof (struct sockaddr_in6);
728 v6->sin6_port = t6->u6_port;
729 v6->sin6_addr = t6->ipv6_addr;
730 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
733 /* Must have a valid address to send to */
740 s->sock_addr = (const struct sockaddr *) &s[1];
741 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
742 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
743 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
748 static int session_cmp_it (void *cls,
749 const GNUNET_HashCode * key,
752 struct SessionCompareContext * cctx = cls;
753 const struct GNUNET_HELLO_Address *address = cctx->addr;
754 struct Session *s = value;
756 socklen_t s_addrlen = s->addrlen;
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
760 udp_address_to_string (NULL, (void *) address->address, address->address_length),
761 GNUNET_a2s (s->sock_addr, s->addrlen));
764 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
765 (s_addrlen == sizeof (struct sockaddr_in)))
767 struct IPv4UdpAddress * u4 = NULL;
768 u4 = (struct IPv4UdpAddress *) address->address;
769 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
770 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
771 (u4->u4_port == s4->sin_port))
778 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
779 (s_addrlen == sizeof (struct sockaddr_in6)))
781 struct IPv6UdpAddress * u6 = NULL;
782 u6 = (struct IPv6UdpAddress *) address->address;
783 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
784 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
785 (u6->u6_port == s6->sin6_port))
798 * Creates a new outbound session the transport service will use to send data to the
801 * @param cls the plugin
802 * @param address the address
803 * @return the session or NULL of max connections exceeded
805 static struct Session *
806 udp_plugin_get_session (void *cls,
807 const struct GNUNET_HELLO_Address *address)
809 struct Session * s = NULL;
810 struct Plugin * plugin = cls;
811 struct IPv6UdpAddress * udp_a6;
812 struct IPv4UdpAddress * udp_a4;
814 GNUNET_assert (plugin != NULL);
815 GNUNET_assert (address != NULL);
818 if ((address->address == NULL) ||
819 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
820 (address->address_length != sizeof (struct IPv6UdpAddress))))
826 if (address->address_length == sizeof (struct IPv4UdpAddress))
828 if (plugin->sockv4 == NULL)
830 udp_a4 = (struct IPv4UdpAddress *) address->address;
831 if (udp_a4->u4_port == 0)
835 if (address->address_length == sizeof (struct IPv6UdpAddress))
837 if (plugin->sockv6 == NULL)
839 udp_a6 = (struct IPv6UdpAddress *) address->address;
840 if (udp_a6->u6_port == 0)
844 /* check if session already exists */
845 struct SessionCompareContext cctx;
849 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking for existing session for peer `%s' `%s' \n", GNUNET_i2s (&address->peer), udp_address_to_string(NULL, address->address, address->address_length));
851 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
852 if (cctx.res != NULL)
855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
860 /* otherwise create new */
861 s = create_session (plugin,
864 address->address_length,
867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
868 "Creating new session %p for peer `%s' address `%s'\n",
870 GNUNET_i2s(&address->peer),
871 udp_address_to_string(NULL,address->address,address->address_length));
873 GNUNET_assert (GNUNET_OK ==
874 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
875 &s->target.hashPubKey,
877 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
879 GNUNET_STATISTICS_set(plugin->env->stats,
880 "# UDP sessions active",
881 GNUNET_CONTAINER_multihashmap_size(plugin->sessions),
887 static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
890 if (udpw->session->addrlen == sizeof (struct sockaddr_in))
891 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
892 if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
893 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
897 * Function that is called with messages created by the fragmentation
898 * module. In the case of the 'proc' callback of the
899 * GNUNET_FRAGMENT_context_create function, this function must
900 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
902 * @param cls closure, the 'struct FragmentationContext'
903 * @param msg the message that was created
906 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
908 struct FragmentationContext *frag_ctx = cls;
909 struct Plugin *plugin = frag_ctx->plugin;
910 struct UDPMessageWrapper * udpw;
913 size_t msg_len = ntohs (msg->size);
916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
919 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
920 udpw->session = frag_ctx->session;
922 udpw->udp = (char *) &udpw[1];
924 udpw->msg_size = msg_len;
925 udpw->cont = frag_ctx->cont;
926 udpw->cont_cls = frag_ctx->cont_cls;
927 udpw->timeout = frag_ctx->timeout;
928 udpw->frag_ctx = frag_ctx;
929 memcpy (udpw->udp, msg, msg_len);
931 enqueue (plugin, udpw);
934 if (s->addrlen == sizeof (struct sockaddr_in))
936 if (plugin->with_v4_ws == GNUNET_NO)
938 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
939 GNUNET_SCHEDULER_cancel(plugin->select_task);
941 plugin->select_task =
942 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
943 GNUNET_TIME_UNIT_FOREVER_REL,
946 &udp_plugin_select, plugin);
947 plugin->with_v4_ws = GNUNET_YES;
951 else if (s->addrlen == sizeof (struct sockaddr_in6))
953 if (plugin->with_v6_ws == GNUNET_NO)
955 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
956 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
958 plugin->select_task_v6 =
959 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
960 GNUNET_TIME_UNIT_FOREVER_REL,
963 &udp_plugin_select_v6, plugin);
964 plugin->with_v6_ws = GNUNET_YES;
974 * Function that can be used by the transport service to transmit
975 * a message using the plugin. Note that in the case of a
976 * peer disconnecting, the continuation MUST be called
977 * prior to the disconnect notification itself. This function
978 * will be called with this peer's HELLO message to initiate
979 * a fresh connection to another peer.
982 * @param s which session must be used
983 * @param msgbuf the message to transmit
984 * @param msgbuf_size number of bytes in 'msgbuf'
985 * @param priority how important is the message (most plugins will
986 * ignore message priority and just FIFO)
987 * @param to how long to wait at most for the transmission (does not
988 * require plugins to discard the message after the timeout,
989 * just advisory for the desired delay; most plugins will ignore
991 * @param cont continuation to call once the message has
992 * been transmitted (or if the transport is ready
993 * for the next transmission call; or if the
994 * peer disconnected...); can be NULL
995 * @param cont_cls closure for cont
996 * @return number of bytes used (on the physical network, with overheads);
997 * -1 on hard errors (i.e. address invalid); 0 is a legal value
998 * and does NOT mean that the message was not transmitted (DV)
1001 udp_plugin_send (void *cls,
1003 const char *msgbuf, size_t msgbuf_size,
1004 unsigned int priority,
1005 struct GNUNET_TIME_Relative to,
1006 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1008 struct Plugin *plugin = cls;
1009 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
1011 struct UDPMessageWrapper * udpw;
1012 struct UDPMessage *udp;
1014 GNUNET_assert (plugin != NULL);
1015 GNUNET_assert (s != NULL);
1017 if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL))
1018 return GNUNET_SYSERR;
1020 if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL))
1021 return GNUNET_SYSERR;
1024 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1027 return GNUNET_SYSERR;
1030 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
1033 return GNUNET_SYSERR;
1036 LOG (GNUNET_ERROR_TYPE_DEBUG,
1037 "UDP transmits %u-byte message to `%s' using address `%s'\n",
1039 GNUNET_i2s (&s->target),
1040 GNUNET_a2s(s->sock_addr, s->addrlen));
1043 udp = (struct UDPMessage *) mbuf;
1044 udp->header.size = htons (mlen);
1045 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
1046 udp->reserved = htonl (0);
1047 udp->sender = *plugin->env->my_identity;
1049 if (mlen <= UDP_MTU)
1051 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
1053 udpw->udp = (char *) &udpw[1];
1054 udpw->msg_size = mlen;
1055 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1057 udpw->cont_cls = cont_cls;
1058 udpw->frag_ctx = NULL;
1060 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
1061 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
1063 enqueue (plugin, udpw);
1067 LOG (GNUNET_ERROR_TYPE_DEBUG,
1068 "UDP has to fragment message \n");
1069 if (s->frag_ctx != NULL)
1070 return GNUNET_SYSERR;
1071 memcpy (&udp[1], msgbuf, msgbuf_size);
1072 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
1074 frag_ctx->plugin = plugin;
1075 frag_ctx->session = s;
1076 frag_ctx->cont = cont;
1077 frag_ctx->cont_cls = cont_cls;
1078 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1079 frag_ctx->bytes_to_send = mlen;
1080 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
1083 s->last_expected_delay,
1088 s->frag_ctx = frag_ctx;
1092 if (s->addrlen == sizeof (struct sockaddr_in))
1094 if (plugin->with_v4_ws == GNUNET_NO)
1096 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1097 GNUNET_SCHEDULER_cancel(plugin->select_task);
1099 plugin->select_task =
1100 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1101 GNUNET_TIME_UNIT_FOREVER_REL,
1104 &udp_plugin_select, plugin);
1105 plugin->with_v4_ws = GNUNET_YES;
1109 else if (s->addrlen == sizeof (struct sockaddr_in6))
1111 if (plugin->with_v6_ws == GNUNET_NO)
1113 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1114 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
1116 plugin->select_task_v6 =
1117 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1118 GNUNET_TIME_UNIT_FOREVER_REL,
1121 &udp_plugin_select_v6, plugin);
1122 plugin->with_v6_ws = GNUNET_YES;
1131 * Our external IP address/port mapping has changed.
1133 * @param cls closure, the 'struct LocalAddrList'
1134 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1135 * the previous (now invalid) one
1136 * @param addr either the previous or the new public IP address
1137 * @param addrlen actual lenght of the address
1140 udp_nat_port_map_callback (void *cls, int add_remove,
1141 const struct sockaddr *addr, socklen_t addrlen)
1143 struct Plugin *plugin = cls;
1144 struct IPv4UdpAddress u4;
1145 struct IPv6UdpAddress u6;
1149 /* convert 'addr' to our internal format */
1150 switch (addr->sa_family)
1153 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1154 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1155 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1160 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1161 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1162 sizeof (struct in6_addr));
1163 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1171 /* modify our published address list */
1172 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1178 * Message tokenizer has broken up an incomming message. Pass it on
1181 * @param cls the 'struct Plugin'
1182 * @param client the 'struct SourceInformation'
1183 * @param hdr the actual message
1186 process_inbound_tokenized_messages (void *cls, void *client,
1187 const struct GNUNET_MessageHeader *hdr)
1189 struct Plugin *plugin = cls;
1190 struct SourceInformation *si = client;
1191 struct GNUNET_ATS_Information ats[2];
1192 struct GNUNET_TIME_Relative delay;
1194 GNUNET_assert (si->session != NULL);
1196 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1197 ats[0].value = htonl (1);
1198 ats[1] = si->session->ats;
1199 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1201 delay = plugin->env->receive (plugin->env->cls,
1204 (const struct GNUNET_ATS_Information *) &ats, 2,
1208 si->session->flow_delay_for_other_peer = delay;
1213 * We've received a UDP Message. Process it (pass contents to main service).
1215 * @param plugin plugin context
1216 * @param msg the message
1217 * @param sender_addr sender address
1218 * @param sender_addr_len number of bytes in sender_addr
1221 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1222 const struct sockaddr *sender_addr,
1223 socklen_t sender_addr_len)
1225 struct SourceInformation si;
1226 struct Session * s = NULL;
1227 struct IPv4UdpAddress u4;
1228 struct IPv6UdpAddress u6;
1232 if (0 != ntohl (msg->reserved))
1234 GNUNET_break_op (0);
1237 if (ntohs (msg->header.size) <
1238 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1240 GNUNET_break_op (0);
1244 /* convert address */
1245 switch (sender_addr->sa_family)
1248 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1249 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1250 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1255 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1256 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1257 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1265 LOG (GNUNET_ERROR_TYPE_DEBUG,
1266 "Received message with %u bytes from peer `%s' at `%s'\n",
1267 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1268 GNUNET_a2s (sender_addr, sender_addr_len));
1270 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1271 s = udp_plugin_get_session(plugin, address);
1272 GNUNET_free (address);
1274 /* iterate over all embedded messages */
1276 si.sender = msg->sender;
1280 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1281 ntohs (msg->header.size) -
1282 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1287 * Scan the heap for a receive context with the given address.
1289 * @param cls the 'struct FindReceiveContext'
1290 * @param node internal node of the heap
1291 * @param element value stored at the node (a 'struct ReceiveContext')
1292 * @param cost cost associated with the node
1293 * @return GNUNET_YES if we should continue to iterate,
1297 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1298 void *element, GNUNET_CONTAINER_HeapCostType cost)
1300 struct FindReceiveContext *frc = cls;
1301 struct DefragContext *e = element;
1303 if ((frc->addr_len == e->addr_len) &&
1304 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1314 * Process a defragmented message.
1316 * @param cls the 'struct ReceiveContext'
1317 * @param msg the message
1320 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1322 struct DefragContext *rc = cls;
1324 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1329 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1334 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1335 rc->src_addr, rc->addr_len);
1338 struct LookupContext
1340 const struct sockaddr * addr;
1343 struct Session *res;
1347 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1349 struct LookupContext *l_ctx = cls;
1350 struct Session * s = value;
1352 if ((s->addrlen == l_ctx->addrlen) &&
1353 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1362 * Transmit an acknowledgement.
1364 * @param cls the 'struct ReceiveContext'
1365 * @param id message ID (unused)
1366 * @param msg ack to transmit
1369 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1371 struct DefragContext *rc = cls;
1373 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1374 struct UDP_ACK_Message *udp_ack;
1376 struct UDPMessageWrapper *udpw;
1379 struct LookupContext l_ctx;
1380 l_ctx.addr = rc->src_addr;
1381 l_ctx.addrlen = rc->addr_len;
1383 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1384 &lookup_session_by_addr_it,
1391 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1392 delay = s->flow_delay_for_other_peer.rel_value;
1394 LOG (GNUNET_ERROR_TYPE_DEBUG,
1395 "Sending ACK to `%s' including delay of %u ms\n",
1396 GNUNET_a2s (rc->src_addr,
1397 (rc->src_addr->sa_family ==
1398 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1401 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1403 udpw->cont_cls = NULL;
1404 udpw->frag_ctx = NULL;
1405 udpw->msg_size = msize;
1407 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1408 udpw->udp = (char *)&udpw[1];
1410 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1411 udp_ack->header.size = htons ((uint16_t) msize);
1412 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1413 udp_ack->delay = htonl (delay);
1414 udp_ack->sender = *rc->plugin->env->my_identity;
1415 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1417 enqueue (rc->plugin, udpw);
1421 static void read_process_msg (struct Plugin *plugin,
1422 const struct GNUNET_MessageHeader *msg,
1426 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1428 GNUNET_break_op (0);
1431 process_udp_message (plugin, (const struct UDPMessage *) msg,
1432 (const struct sockaddr *) addr, fromlen);
1436 static void read_process_ack (struct Plugin *plugin,
1437 const struct GNUNET_MessageHeader *msg,
1441 const struct GNUNET_MessageHeader *ack;
1442 const struct UDP_ACK_Message *udp_ack;
1443 struct LookupContext l_ctx;
1444 struct Session *s = NULL;
1445 struct GNUNET_TIME_Relative flow_delay;
1447 if (ntohs (msg->size) <
1448 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1450 GNUNET_break_op (0);
1454 udp_ack = (const struct UDP_ACK_Message *) msg;
1456 l_ctx.addr = (const struct sockaddr *) addr;
1457 l_ctx.addrlen = fromlen;
1459 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1460 &lookup_session_by_addr_it,
1464 if ((s == NULL) || (s->frag_ctx == NULL))
1467 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1468 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1469 flow_delay.rel_value);
1470 s->flow_delay_from_other_peer =
1471 GNUNET_TIME_relative_to_absolute (flow_delay);
1473 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1474 if (ntohs (ack->size) !=
1475 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1477 GNUNET_break_op (0);
1481 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1483 LOG (GNUNET_ERROR_TYPE_DEBUG,
1484 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1485 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1486 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1490 LOG (GNUNET_ERROR_TYPE_DEBUG,
1491 "FULL MESSAGE ACKed\n",
1492 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1493 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1494 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1496 struct UDPMessageWrapper * udpw = NULL;
1497 if (s->addrlen == sizeof (struct sockaddr_in6))
1499 udpw = plugin->ipv6_queue_head;
1502 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1504 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1510 if (s->addrlen == sizeof (struct sockaddr_in))
1512 udpw = plugin->ipv4_queue_head;
1515 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1517 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1524 if (s->frag_ctx->cont != NULL)
1526 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1527 GNUNET_free (s->frag_ctx);
1532 static void read_process_fragment (struct Plugin *plugin,
1533 const struct GNUNET_MessageHeader *msg,
1537 struct DefragContext *d_ctx;
1538 struct GNUNET_TIME_Absolute now;
1539 struct FindReceiveContext frc;
1543 frc.addr = (const struct sockaddr *) addr;
1544 frc.addr_len = fromlen;
1546 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1547 (unsigned int) ntohs (msg->size),
1548 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1549 /* Lookup existing receive context for this address */
1550 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1551 &find_receive_context,
1553 now = GNUNET_TIME_absolute_get ();
1558 /* Create a new defragmentation context */
1559 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1560 memcpy (&d_ctx[1], addr, fromlen);
1561 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1562 d_ctx->addr_len = fromlen;
1563 d_ctx->plugin = plugin;
1565 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1566 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1567 &fragment_msg_proc, &ack_proc);
1569 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1570 (GNUNET_CONTAINER_HeapCostType)
1572 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1573 (unsigned int) ntohs (msg->size),
1574 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1578 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1579 (unsigned int) ntohs (msg->size),
1580 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1583 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1585 /* keep this 'rc' from expiring */
1586 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1587 (GNUNET_CONTAINER_HeapCostType)
1590 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1591 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1593 /* remove 'rc' that was inactive the longest */
1594 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1595 GNUNET_assert (NULL != d_ctx);
1596 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1597 GNUNET_free (d_ctx);
1602 * Read and process a message from the given socket.
1604 * @param plugin the overall plugin
1605 * @param rsock socket to read from
1608 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1612 char buf[65536] GNUNET_ALIGN;
1614 const struct GNUNET_MessageHeader *msg;
1616 fromlen = sizeof (addr);
1617 memset (&addr, 0, sizeof (addr));
1618 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1619 (struct sockaddr *) &addr, &fromlen);
1621 if (size < sizeof (struct GNUNET_MessageHeader))
1623 GNUNET_break_op (0);
1626 msg = (const struct GNUNET_MessageHeader *) buf;
1628 LOG (GNUNET_ERROR_TYPE_DEBUG,
1629 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1630 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1632 if (size != ntohs (msg->size))
1634 GNUNET_break_op (0);
1638 switch (ntohs (msg->type))
1640 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1641 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1644 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1645 read_process_msg (plugin, msg, addr, fromlen);
1648 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1649 read_process_ack (plugin, msg, addr, fromlen);;
1652 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1653 read_process_fragment (plugin, msg, addr, fromlen);
1657 GNUNET_break_op (0);
1663 udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
1667 struct GNUNET_TIME_Absolute max;
1668 struct GNUNET_TIME_Absolute ;
1670 struct UDPMessageWrapper *udpw = NULL;
1672 if (sock == plugin->sockv4)
1674 udpw = plugin->ipv4_queue_head;
1676 else if (sock == plugin->sockv6)
1678 udpw = plugin->ipv6_queue_head;
1686 const struct sockaddr * sa = udpw->session->sock_addr;
1687 slen = udpw->session->addrlen;
1689 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1691 while (udpw != NULL)
1693 if (max.abs_value != udpw->timeout.abs_value)
1695 /* Message timed out */
1697 if (udpw->cont != NULL)
1698 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1699 if (udpw->frag_ctx != NULL)
1701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1702 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1703 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1704 GNUNET_free (udpw->frag_ctx);
1705 udpw->session->frag_ctx = NULL;
1709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1710 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1713 if (sock == plugin->sockv4)
1715 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1717 udpw = plugin->ipv4_queue_head;
1719 else if (sock == plugin->sockv6)
1721 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1723 udpw = plugin->ipv6_queue_head;
1728 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1729 if (delta.rel_value == 0)
1731 /* this message is not delayed */
1732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1733 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1738 /* this message is delayed, try next */
1739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1740 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1749 /* No message left */
1753 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
1755 if (GNUNET_SYSERR == sent)
1757 LOG (GNUNET_ERROR_TYPE_ERROR,
1758 "UDP could not transmit %u-byte message to `%s': `%s'\n",
1759 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen),
1761 if (udpw->cont != NULL)
1762 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1766 LOG (GNUNET_ERROR_TYPE_DEBUG,
1767 "UDP transmitted %u-byte message to `%s' (%d: %s)\n",
1768 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1769 (sent < 0) ? STRERROR (errno) : "ok");
1771 /* This was just a message fragment */
1772 if (udpw->frag_ctx != NULL)
1774 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1776 /* This was a complete message*/
1779 if (udpw->cont != NULL)
1780 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1783 if (sock == plugin->sockv4)
1784 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1785 else if (sock == plugin->sockv6)
1786 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1794 * We have been notified that our readset has something to read. We don't
1795 * know which socket needs to be read, so we have to check each one
1796 * Then reschedule this function to be called again once more is available.
1798 * @param cls the plugin handle
1799 * @param tc the scheduling context (for rescheduling this function again)
1802 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1804 struct Plugin *plugin = cls;
1806 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1807 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1809 plugin->with_v4_ws = GNUNET_NO;
1811 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1813 if ((NULL != plugin->sockv4) &&
1814 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1815 udp_select_read (plugin, plugin->sockv4);
1819 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1821 if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
1822 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
1824 udp_select_send (plugin, plugin->sockv4);
1828 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1829 GNUNET_SCHEDULER_cancel (plugin->select_task);
1830 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1831 GNUNET_TIME_UNIT_FOREVER_REL,
1833 (plugin->ipv4_queue_head != NULL) ? plugin->ws_v4 : NULL,
1834 &udp_plugin_select, plugin);
1835 if (plugin->ipv4_queue_head != NULL)
1836 plugin->with_v4_ws = GNUNET_YES;
1838 plugin->with_v4_ws = GNUNET_NO;
1843 * We have been notified that our readset has something to read. We don't
1844 * know which socket needs to be read, so we have to check each one
1845 * Then reschedule this function to be called again once more is available.
1847 * @param cls the plugin handle
1848 * @param tc the scheduling context (for rescheduling this function again)
1851 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1853 struct Plugin *plugin = cls;
1855 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1856 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1859 plugin->with_v6_ws = GNUNET_NO;
1860 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1862 if ((NULL != plugin->sockv6) &&
1863 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1864 udp_select_read (plugin, plugin->sockv6);
1867 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1869 if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
1870 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
1872 udp_select_send (plugin, plugin->sockv6);
1875 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1876 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
1877 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1878 GNUNET_TIME_UNIT_FOREVER_REL,
1880 (plugin->ipv6_queue_head != NULL) ? plugin->ws_v6 : NULL,
1881 &udp_plugin_select_v6, plugin);
1882 if (plugin->ipv6_queue_head != NULL)
1883 plugin->with_v6_ws = GNUNET_YES;
1885 plugin->with_v6_ws = GNUNET_NO;
1890 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1893 int sockets_created = 0;
1894 struct sockaddr *serverAddr;
1895 struct sockaddr *addrs[2];
1896 socklen_t addrlens[2];
1899 /* Create IPv6 socket */
1900 if (plugin->enable_ipv6 == GNUNET_YES)
1902 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1903 if (NULL == plugin->sockv6)
1905 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
1906 plugin->enable_ipv6 = GNUNET_NO;
1910 #if HAVE_SOCKADDR_IN_SIN_LEN
1911 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1913 serverAddrv6->sin6_family = AF_INET6;
1914 serverAddrv6->sin6_addr = in6addr_any;
1915 serverAddrv6->sin6_port = htons (plugin->port);
1916 addrlen = sizeof (struct sockaddr_in6);
1917 serverAddr = (struct sockaddr *) serverAddrv6;
1918 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1919 ntohs (serverAddrv6->sin6_port));
1921 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1924 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1925 LOG (GNUNET_ERROR_TYPE_DEBUG,
1926 "IPv6 Binding failed, trying new port %d\n",
1927 ntohs (serverAddrv6->sin6_port));
1931 GNUNET_NETWORK_socket_close (plugin->sockv6);
1932 plugin->sockv6 = NULL;
1936 if (plugin->sockv6 != NULL)
1938 LOG (GNUNET_ERROR_TYPE_DEBUG,
1939 "IPv6 socket created on port %d\n",
1940 ntohs (serverAddrv6->sin6_port));
1941 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1942 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1948 /* Create IPv4 socket */
1949 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1950 if (NULL == plugin->sockv4)
1952 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1956 #if HAVE_SOCKADDR_IN_SIN_LEN
1957 serverAddrv4->sin_len = sizeof (serverAddrv4);
1959 serverAddrv4->sin_family = AF_INET;
1960 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1961 serverAddrv4->sin_port = htons (plugin->port);
1962 addrlen = sizeof (struct sockaddr_in);
1963 serverAddr = (struct sockaddr *) serverAddrv4;
1965 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1966 ntohs (serverAddrv4->sin_port));
1968 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1971 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1972 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1973 ntohs (serverAddrv4->sin_port));
1977 GNUNET_NETWORK_socket_close (plugin->sockv4);
1978 plugin->sockv4 = NULL;
1982 if (plugin->sockv4 != NULL)
1984 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
1985 addrlens[sockets_created] = sizeof (struct sockaddr_in);
1990 /* Create file descriptors */
1991 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
1992 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
1993 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
1994 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
1995 if (NULL != plugin->sockv4)
1997 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
1998 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
2001 if (sockets_created == 0)
2002 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2004 plugin->select_task =
2005 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2006 GNUNET_TIME_UNIT_FOREVER_REL,
2009 &udp_plugin_select, plugin);
2010 plugin->with_v4_ws = GNUNET_NO;
2012 if (plugin->enable_ipv6 == GNUNET_YES)
2014 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
2015 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
2016 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
2017 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
2018 if (NULL != plugin->sockv6)
2020 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
2021 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
2024 plugin->select_task_v6 =
2025 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2026 GNUNET_TIME_UNIT_FOREVER_REL,
2029 &udp_plugin_select_v6, plugin);
2030 plugin->with_v6_ws = GNUNET_NO;
2033 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2034 GNUNET_NO, plugin->port,
2036 (const struct sockaddr **) addrs, addrlens,
2037 &udp_nat_port_map_callback, NULL, plugin);
2039 return sockets_created;
2044 * The exported method. Makes the core api available via a global and
2045 * returns the udp transport API.
2047 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2048 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2051 libgnunet_plugin_transport_udp_init (void *cls)
2053 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2054 struct GNUNET_TRANSPORT_PluginFunctions *api;
2055 struct Plugin *plugin;
2057 unsigned long long port;
2058 unsigned long long aport;
2059 unsigned long long broadcast;
2060 unsigned long long udp_max_bps;
2061 unsigned long long enable_v6;
2062 char * bind4_address;
2063 char * bind6_address;
2064 struct GNUNET_TIME_Relative interval;
2066 struct sockaddr_in serverAddrv4;
2067 struct sockaddr_in6 serverAddrv6;
2071 if (NULL == env->receive)
2073 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2074 initialze the plugin or the API */
2075 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2077 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2078 api->address_to_string = &udp_address_to_string;
2079 api->string_to_address = &udp_string_to_address;
2083 GNUNET_assert( NULL != env->stats);
2085 /* Get port number */
2087 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
2091 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2092 "ADVERTISED_PORT", &aport))
2096 LOG (GNUNET_ERROR_TYPE_WARNING,
2097 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
2104 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
2107 enable_v6 = GNUNET_NO;
2110 enable_v6 = GNUNET_YES;
2114 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
2115 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
2118 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2119 "BINDTO", &bind4_address))
2121 LOG (GNUNET_ERROR_TYPE_DEBUG,
2122 "Binding udp plugin to specific address: `%s'\n",
2124 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
2126 GNUNET_free (bind4_address);
2132 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2133 "BINDTO6", &bind6_address))
2135 LOG (GNUNET_ERROR_TYPE_DEBUG,
2136 "Binding udp plugin to specific address: `%s'\n",
2139 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
2141 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
2143 GNUNET_free_non_null (bind4_address);
2144 GNUNET_free (bind6_address);
2150 /* Enable neighbour discovery */
2151 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
2153 if (broadcast == GNUNET_SYSERR)
2154 broadcast = GNUNET_NO;
2156 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
2157 "BROADCAST_INTERVAL", &interval))
2159 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
2162 /* Maximum datarate */
2163 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2164 "MAX_BPS", &udp_max_bps))
2166 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
2169 plugin = GNUNET_malloc (sizeof (struct Plugin));
2170 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2172 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
2173 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
2176 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
2177 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2178 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
2179 plugin->port = port;
2180 plugin->aport = aport;
2181 plugin->broadcast_interval = interval;
2182 plugin->enable_ipv6 = enable_v6;
2187 api->disconnect = &udp_disconnect;
2188 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2189 api->address_to_string = &udp_address_to_string;
2190 api->string_to_address = &udp_string_to_address;
2191 api->check_address = &udp_plugin_check_address;
2192 api->get_session = &udp_plugin_get_session;
2193 api->send = &udp_plugin_send;
2195 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
2196 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
2197 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
2199 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
2200 GNUNET_free (plugin);
2205 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
2206 if (broadcast == GNUNET_YES)
2207 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
2210 GNUNET_free_non_null (bind4_address);
2211 GNUNET_free_non_null (bind6_address);
2217 heap_cleanup_iterator (void *cls,
2218 struct GNUNET_CONTAINER_HeapNode *
2219 node, void *element,
2220 GNUNET_CONTAINER_HeapCostType
2223 struct DefragContext * d_ctx = element;
2225 GNUNET_CONTAINER_heap_remove_node (node);
2226 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
2227 GNUNET_free (d_ctx);
2234 * The exported method. Makes the core api available via a global and
2235 * returns the udp transport API.
2237 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2241 libgnunet_plugin_transport_udp_done (void *cls)
2243 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2244 struct Plugin *plugin = api->cls;
2252 stop_broadcast (plugin);
2254 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2256 GNUNET_SCHEDULER_cancel (plugin->select_task);
2257 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2259 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2261 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
2262 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2265 /* Closing sockets */
2266 if (plugin->sockv4 != NULL)
2268 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2269 plugin->sockv4 = NULL;
2271 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
2272 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
2274 if (plugin->sockv6 != NULL)
2276 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2277 plugin->sockv6 = NULL;
2279 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
2280 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
2283 GNUNET_NAT_unregister (plugin->nat);
2285 if (plugin->defrag_ctxs != NULL)
2287 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2288 heap_cleanup_iterator, NULL);
2289 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2290 plugin->defrag_ctxs = NULL;
2292 if (plugin->mst != NULL)
2294 GNUNET_SERVER_mst_destroy(plugin->mst);
2298 /* Clean up leftover messages */
2299 struct UDPMessageWrapper * udpw;
2300 udpw = plugin->ipv4_queue_head;
2301 while (udpw != NULL)
2303 struct UDPMessageWrapper *tmp = udpw->next;
2304 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
2305 if (udpw->cont != NULL)
2306 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2310 udpw = plugin->ipv6_queue_head;
2311 while (udpw != NULL)
2313 struct UDPMessageWrapper *tmp = udpw->next;
2314 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
2315 if (udpw->cont != NULL)
2316 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2321 /* Clean up sessions */
2322 LOG (GNUNET_ERROR_TYPE_DEBUG,
2323 "Cleaning up sessions\n");
2324 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2325 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2328 GNUNET_free (plugin);
2334 /* end of plugin_transport_udp.c */